PIC18FXX39 Datasheet, PDF (87/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

FIGURE 9-5:
PIC18FXX39
BLOCK DIAGRAM OF RB2:RB0 PINS
RBPU⁽²⁾
Data Bus
WR Port
WR TRIS
Data Latch
DQ
CK
TRIS Latch
DQ
CK
VDD
P
Weak
Pull-up
I/O pin⁽¹⁾
TTL
Input
Buffer
RD TRIS
RD Port
QD
EN
RB0/INT
Schmitt Trigger
Buffer
Note 1: I/O pins have diode protection to VDD and VSS.
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit (OPTION_REG<7>).
FIGURE 9-6:
BLOCK DIAGRAM OF RB3 PIN
RBPU⁽²⁾
‘1’
Data Bus
WR LATB or
WR PORTB
WR TRISB
RD TRISB
RD LATB
RD PORTB
Data Latch
DQ
CK
TRIS Latch
D
CK Q
Q
D
EN
VDD
P
Weak
Pull-up
VDD
P
N
VSS
TTL
Input
Buffer
I/O pin⁽¹⁾
Note 1: I/O pin has diode protection to VDD and VSS.
2: To enable weak pull-ups, set the appropriate DDR bit(s) and clear the RBPU bit (INTCON2<7>).
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Preliminary
DS30485B-page 87